Hi,
Before buying a ps2 I would like to know a few things?
1. Which PS2 model would you recommend?
2. Which PS2 "mod" method do you prefer and why?
3. Are there any decent sites in Europe that sell premodded PS2 consoles?
4. Do playstation 2 wireless controllers work well?

I'm not too sure about the first three. However, I do not recommend the use of wireless Playstation 2 controllers, for several reasons. First, Sony never made their own wireless PS2 controller. All of the wireless controllers were made by other companies, and most of those third-party controllers aren't very high in quality. (Pelican, for example.) Also, you have to plug in a dongle, which is inconvenient, especially if you ever want to bring it to a friend's home, in order to play multiplayer games. You'll have to carry not only the controller, but the dongle, with you, and make sure you don't leave the dongle behind at your friend's house after you leave. Also, wireless controllers from that generation tend to drain batteries rather quickly, from my experiences.